Slave are normal in that kind of civilization level, because the lack of technology and machine power. Since slave were used for cheap manpower that time. It will be abnormal if the civilization level is same as our time. But like someone say before, even in our time there is slave with...
Duh.. he is so stupid. If he want a normal live, he must become farmer, not adventure that can make you famous even don't want to. But okay, still try to read eat. I'm a trash eater(reader) after all